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6594deb0 | 1 | ;;; nroff-mode.el --- GNU Emacs major mode for editing nroff source |
4821e2af | 2 | |
878c1d73 | 3 | ;; Copyright (C) 1985, 1986, 1994, 1995 Free Software Foundation, Inc. |
9750e079 | 4 | |
4821e2af | 5 | ;; Maintainer: FSF |
d7b4d18f | 6 | ;; Keywords: wp |
4821e2af | 7 | |
a2535589 JA |
8 | ;; This file is part of GNU Emacs. |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 12 | ;; the Free Software Foundation; either version 2, or (at your option) |
a2535589 JA |
13 | ;; any later version. |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | ;; Boston, MA 02111-1307, USA. | |
a2535589 | 24 | |
edbd2f74 ER |
25 | ;;; Commentary: |
26 | ||
27 | ;; This package is a major mode for editing nroff source code. It knows | |
28 | ;; about various nroff constructs, ms, mm, and me macros, and will fill | |
29 | ;; and indent paragraphs properly in their presence. It also includes | |
30 | ;; a command to count text lines (excluding nroff constructs), a command | |
31 | ;; to center a line, and movement commands that know how to skip macros. | |
32 | ||
878c1d73 RS |
33 | ;; Paragraph filling and line-counting currently don't respect comments, |
34 | ;; as they should. | |
35 | ||
4821e2af ER |
36 | ;;; Code: |
37 | ||
e4550233 RS |
38 | (defgroup nroff nil |
39 | "Nroff mode." | |
e8955f1d | 40 | :group 'wp |
e4550233 RS |
41 | :prefix "nroff-") |
42 | ||
e4550233 RS |
43 | (defcustom nroff-electric-mode nil |
44 | "*Non-nil means automatically closing requests when you insert an open." | |
45 | :group 'nroff | |
46 | :type 'boolean) | |
934b4e4f | 47 | |
74ac2467 GM |
48 | (defvar nroff-mode-map |
49 | (let ((map (make-sparse-keymap))) | |
50 | (define-key map "\t" 'tab-to-tab-stop) | |
51 | (define-key map "\es" 'center-line) | |
52 | (define-key map "\e?" 'count-text-lines) | |
53 | (define-key map "\n" 'electric-nroff-newline) | |
54 | (define-key map "\en" 'forward-text-line) | |
55 | (define-key map "\ep" 'backward-text-line) | |
56 | map) | |
57 | "Major mode keymap for `nroff-mode'.") | |
58 | ||
59 | (defvar nroff-mode-syntax-table | |
60 | (let ((st (copy-syntax-table text-mode-syntax-table))) | |
61 | ;; " isn't given string quote syntax in text-mode but it | |
62 | ;; (arguably) should be for use round nroff arguments (with ` and | |
63 | ;; ' used otherwise). | |
64 | (modify-syntax-entry ?\" "\" 2" st) | |
65 | ;; Comments are delimited by \" and newline. | |
66 | (modify-syntax-entry ?\\ "\\ 1" st) | |
67 | (modify-syntax-entry ?\n "> 1" st) | |
68 | st) | |
69 | "Syntax table used while in `nroff-mode'.") | |
878c1d73 | 70 | |
e4550233 | 71 | (defcustom nroff-font-lock-keywords |
878c1d73 RS |
72 | (list |
73 | ;; Directives are . or ' at start of line, followed by | |
74 | ;; optional whitespace, then command (which my be longer than | |
75 | ;; 2 characters in groff). Perhaps the arguments should be | |
76 | ;; fontified as well. | |
77 | "^[.']\\s-*\\sw+" | |
78 | ;; There are numerous groff escapes; the following get things | |
79 | ;; like \-, \(em (standard troff) and \f[bar] (groff | |
80 | ;; variants). This won't currently do groff's \A'foo' and | |
81 | ;; the like properly. One might expect it to highlight an escape's | |
82 | ;; arguments in common cases, like \f. | |
83 | (concat "\\\\" ; backslash | |
84 | "\\(" ; followed by various possibilities | |
85 | (mapconcat 'identity | |
86 | '("[f*n]*\\[.+]" ; some groff extensions | |
87 | "(.." ; two chars after ( | |
88 | "[^(\"]" ; single char escape | |
89 | ) "\\|") | |
90 | "\\)") | |
91 | ) | |
74ac2467 | 92 | "Font-lock highlighting control in `nroff-mode'." |
e4550233 RS |
93 | :group 'nroff |
94 | :type '(repeat regexp)) | |
878c1d73 | 95 | |
6594deb0 | 96 | ;;;###autoload |
74ac2467 | 97 | (define-derived-mode nroff-mode text-mode "Nroff" |
a2535589 JA |
98 | "Major mode for editing text intended for nroff to format. |
99 | \\{nroff-mode-map} | |
6d1f885f BP |
100 | Turning on Nroff mode runs `text-mode-hook', then `nroff-mode-hook'. |
101 | Also, try `nroff-electric-mode', for automatically inserting | |
a2535589 | 102 | closing requests for requests that are used in matched pairs." |
74ac2467 GM |
103 | (set (make-local-variable 'font-lock-defaults) |
104 | ;; SYNTAX-BEGIN is set to backward-paragraph to avoid slow-down | |
105 | ;; near the end of large buffers due to searching to buffer's | |
106 | ;; beginning. | |
107 | '(nroff-font-lock-keywords nil t nil backward-paragraph)) | |
108 | (set (make-local-variable 'nroff-electric-mode) nil) | |
109 | (set (make-local-variable 'outline-regexp) "\\.H[ ]+[1-7]+ ") | |
110 | (set (make-local-variable 'outline-level) 'nroff-outline-level) | |
a2535589 | 111 | ;; now define a bunch of variables for use by commands in this mode |
74ac2467 GM |
112 | (set (make-local-variable 'page-delimiter) "^\\.\\(bp\\|SK\\|OP\\)") |
113 | (set (make-local-variable 'paragraph-start) | |
114 | (concat "[.']\\|" paragraph-start)) | |
115 | (set (make-local-variable 'paragraph-separate) | |
116 | (concat "[.']\\|" paragraph-separate)) | |
a2535589 | 117 | ;; comment syntax added by mit-erl!gildea 18 Apr 86 |
74ac2467 GM |
118 | (set (make-local-variable 'comment-start) "\\\" ") |
119 | (set (make-local-variable 'comment-start-skip) "\\\\\"[ \t]*") | |
120 | (set (make-local-variable 'comment-column) 24) | |
121 | (set (make-local-variable 'comment-indent-function) 'nroff-comment-indent)) | |
a2535589 | 122 | |
a6234246 RS |
123 | (defun nroff-outline-level () |
124 | (save-excursion | |
125 | (looking-at outline-regexp) | |
126 | (skip-chars-forward ".H ") | |
127 | (string-to-int (buffer-substring (point) (+ 1 (point)))))) | |
128 | ||
a2535589 JA |
129 | ;;; Compute how much to indent a comment in nroff/troff source. |
130 | ;;; By mit-erl!gildea April 86 | |
131 | (defun nroff-comment-indent () | |
132 | "Compute indent for an nroff/troff comment. | |
133 | Puts a full-stop before comments on a line by themselves." | |
134 | (let ((pt (point))) | |
135 | (unwind-protect | |
136 | (progn | |
137 | (skip-chars-backward " \t") | |
138 | (if (bolp) | |
139 | (progn | |
140 | (setq pt (1+ pt)) | |
141 | (insert ?.) | |
142 | 1) | |
143 | (if (save-excursion | |
144 | (backward-char 1) | |
145 | (looking-at "^[.']")) | |
146 | 1 | |
147 | (max comment-column | |
148 | (* 8 (/ (+ (current-column) | |
149 | 9) 8)))))) ; add 9 to ensure at least two blanks | |
150 | (goto-char pt)))) | |
151 | ||
152 | (defun count-text-lines (start end &optional print) | |
153 | "Count lines in region, except for nroff request lines. | |
154 | All lines not starting with a period are counted up. | |
155 | Interactively, print result in echo area. | |
156 | Noninteractively, return number of non-request lines from START to END." | |
157 | (interactive "r\np") | |
158 | (if print | |
159 | (message "Region has %d text lines" (count-text-lines start end)) | |
160 | (save-excursion | |
161 | (save-restriction | |
162 | (narrow-to-region start end) | |
163 | (goto-char (point-min)) | |
164 | (- (buffer-size) (forward-text-line (buffer-size))))))) | |
165 | ||
166 | (defun forward-text-line (&optional cnt) | |
167 | "Go forward one nroff text line, skipping lines of nroff requests. | |
168 | An argument is a repeat count; if negative, move backward." | |
169 | (interactive "p") | |
170 | (if (not cnt) (setq cnt 1)) | |
171 | (while (and (> cnt 0) (not (eobp))) | |
172 | (forward-line 1) | |
173 | (while (and (not (eobp)) (looking-at "[.'].")) | |
174 | (forward-line 1)) | |
175 | (setq cnt (- cnt 1))) | |
176 | (while (and (< cnt 0) (not (bobp))) | |
177 | (forward-line -1) | |
178 | (while (and (not (bobp)) | |
179 | (looking-at "[.'].")) | |
180 | (forward-line -1)) | |
181 | (setq cnt (+ cnt 1))) | |
182 | cnt) | |
183 | ||
184 | (defun backward-text-line (&optional cnt) | |
185 | "Go backward one nroff text line, skipping lines of nroff requests. | |
186 | An argument is a repeat count; negative means move forward." | |
187 | (interactive "p") | |
188 | (forward-text-line (- cnt))) | |
189 | ||
190 | (defconst nroff-brace-table | |
191 | '((".(b" . ".)b") | |
192 | (".(l" . ".)l") | |
193 | (".(q" . ".)q") | |
194 | (".(c" . ".)c") | |
195 | (".(x" . ".)x") | |
196 | (".(z" . ".)z") | |
197 | (".(d" . ".)d") | |
198 | (".(f" . ".)f") | |
199 | (".LG" . ".NL") | |
200 | (".SM" . ".NL") | |
201 | (".LD" . ".DE") | |
202 | (".CD" . ".DE") | |
203 | (".BD" . ".DE") | |
204 | (".DS" . ".DE") | |
205 | (".DF" . ".DE") | |
206 | (".FS" . ".FE") | |
207 | (".KS" . ".KE") | |
208 | (".KF" . ".KE") | |
209 | (".LB" . ".LE") | |
210 | (".AL" . ".LE") | |
211 | (".BL" . ".LE") | |
212 | (".DL" . ".LE") | |
213 | (".ML" . ".LE") | |
214 | (".RL" . ".LE") | |
215 | (".VL" . ".LE") | |
216 | (".RS" . ".RE") | |
217 | (".TS" . ".TE") | |
218 | (".EQ" . ".EN") | |
219 | (".PS" . ".PE") | |
220 | (".BS" . ".BE") | |
221 | (".G1" . ".G2") ; grap | |
222 | (".na" . ".ad b") | |
223 | (".nf" . ".fi") | |
224 | (".de" . ".."))) | |
225 | ||
226 | (defun electric-nroff-newline (arg) | |
227 | "Insert newline for nroff mode; special if electric-nroff mode. | |
6d1f885f | 228 | In `electric-nroff-mode', if ending a line containing an nroff opening request, |
a2535589 JA |
229 | automatically inserts the matching closing request after point." |
230 | (interactive "P") | |
231 | (let ((completion (save-excursion | |
232 | (beginning-of-line) | |
233 | (and (null arg) | |
234 | nroff-electric-mode | |
235 | (<= (point) (- (point-max) 3)) | |
236 | (cdr (assoc (buffer-substring (point) | |
237 | (+ 3 (point))) | |
238 | nroff-brace-table))))) | |
239 | (needs-nl (not (looking-at "[ \t]*$")))) | |
240 | (if (null completion) | |
241 | (newline (prefix-numeric-value arg)) | |
242 | (save-excursion | |
243 | (insert "\n\n" completion) | |
244 | (if needs-nl (insert "\n"))) | |
245 | (forward-char 1)))) | |
246 | ||
247 | (defun electric-nroff-mode (&optional arg) | |
6d1f885f BP |
248 | "Toggle `nroff-electric-newline' minor mode. |
249 | `nroff-electric-newline' forces Emacs to check for an nroff request at the | |
250 | beginning of the line, and insert the matching closing request if necessary. | |
251 | This command toggles that mode (off->on, on->off), with an argument, | |
252 | turns it on iff arg is positive, otherwise off." | |
a2535589 JA |
253 | (interactive "P") |
254 | (or (eq major-mode 'nroff-mode) (error "Must be in nroff mode")) | |
255 | (or (assq 'nroff-electric-mode minor-mode-alist) | |
256 | (setq minor-mode-alist (append minor-mode-alist | |
257 | (list '(nroff-electric-mode | |
258 | " Electric"))))) | |
259 | (setq nroff-electric-mode | |
260 | (cond ((null arg) (null nroff-electric-mode)) | |
261 | (t (> (prefix-numeric-value arg) 0))))) | |
262 | ||
896546cd RS |
263 | (provide 'nroff-mode) |
264 | ||
6594deb0 | 265 | ;;; nroff-mode.el ends here |